关键词: 渗透树脂, 冷光美白, 树脂充填, 微渗漏, 体式显微镜

Abstract: Objective    To study the effect of permeable resin on microleakage of resin filled enamel after edge bleaching. Methods    Totally 45 third molars extracted due to impaction provided by the outpatient department of oral and maxillofacial surgery of the First Affiliated Hospital of Zhengzhou University were selected，and a class V hole was prepared in their buccal neck. All isolated teeth were randomly divided into 3 groups with 15 teeth in each group. According to the processing method，they were recorded as resin filling group，resin filling + cold light whitening group and resin filling + cold light whitening + permeable resin group. After 500 cycles of cold and hot temperature，the three groups were immersed in 2% alkaline fuchsin solution for 24 hours. The isolated teeth were cut longitudinally along the buccal tongue，observed by stereomicroscope，and the dye penetration depth was measured by S-EYE software. Results    There was significant difference in the total dye penetration depth among the three groups（H = 10.182，P < 0.05）. Among them，the dye penetration depth of resin filling + cold light whitening group was greater than that of resin filling group and resin filling + cold light whitening + penetrating resin group，and the difference was statistically significant（P < 0.05）. There was no significant difference in dye penetration depth between resin filling + cold light whitening + penetrating resin group and resin filling group（P > 0.05）. Conclusion    Bleach aggravates the microleakage at the edge of resin filling，and the application of penetrating resin can effectively reduce the effect of bleach on the microleakage at the edge of resin filling.

Key words: permeable resin, cold light bleaching, resin filling, microleakage, pose microscope